DE102004062735B4 - Device for aligning sheets that are placed on a stack of sheets - Google Patents

Abstract

Device for aligning sheets by means of front edge stops, the front edge stops being arranged on a common vertically displaceable front edge shaft, characterized in that means (38, 39; 44, 46; 54) are provided for the vertical displacement of the front edge shaft (32) and in that the front edge shaft ( 32) has support devices (38, 39) which are arranged such that they can be brought into working contact with lifting means (44, 46) of an auxiliary stack carrier (41).

Description

It is known to provide front edge stops for the sheets to be placed on a stack in the delivery of sheet processing machines. The sheets conveyed to the stack hit these front edge stops and are then deposited exactly on the sheet stack.

As is well known, the front edge stops are on a common traverse - a so-called front edge stop shaft - arranged and z. B. mounted pivotably about an axis of rotation arranged below the front edge stops.

The DE 34 23 265 A1 shows e.g. B. Leading edge stops with leading edge stop shaft below. It is here a disadvantage that hurdle boards or rake z. B. for a non-stop operation can only be inserted below the leading edge shaft, since access to the upper stack area by the leading edge stops and - shaft is obstructed.

through the DE 195 07 370 C2 it is known, for example, to arrange the leading edge stops in a vertically displaceable manner.

In DE 199 10 242 C2 describes a device for forming stacks which has a stop surface structure which can be pivoted between an operative position stopping the sheets and a position pivoted away therefrom. The abutment surface structure is carried by a carrier profile, at each of whose two ends a rotary bearing part is arranged.

The invention is therefore based on the object of creating a device which offers the possibility of introducing auxiliary stacking devices, in particular for non-stop operation, into the upper stack area in the stack.

The object is achieved according to the invention by the features of claim 1.

It is an advantage of the invention that the leading edge stops and shaft are arranged to be vertically slidable upwards, making it possible to free up the top stacking area for the insertion of rakes or hurdle boards for a non-stop stack change while maintaining the function of the leading edge stops is obtained. In order to initiate the vertical displacement of the leading edge shaft, the invention provides for at least one support element, e.g. B. a rotatably mounted roller, which comes into contact with a component of the rake or the hurdle board in such a way that the leading edge shaft is raised in linear guides. In one exemplary embodiment, the component is a run-on bevel arranged on a rake or hurdle board frame.

In an advantageous embodiment, a switch that can be actuated by means of the movement of the leading edge shaft is provided, which switches the main stack lifting device to a standstill in the event of an undesirably large deflection of the leading edge shaft.

An embodiment of the invention is illustrated in the drawings and is described below.

• 1 eine Bogen verarbeitende Druckmaschine im Schnitt in schematischer Darstellung,
• 2 eine perspektivische Ansicht auf die erfindungsgemäße Vorrichtung von hinten gegen die Bogentransportrichtung,
• 3 die erfindungsgemäße Vorrichtung von der Seite in schematischer Darstellung,
• 4 eine Draufsicht auf den Non-Stop-Rechen mit Rechenrahmen bzw. -wagen,
• 5 eine Seitenansicht einer nicht erfindungsgemäßen Vorrichtung mit pneumatisch betätigbarem Arbeitszylinder,
• 6a eine Seitenansicht des Ausführungsbeispiels mit einer Stellung der Vorderkantenwelle in Grundstellung,
• 6b eine Seitenansicht des Ausführungsbeispiels mit einer Stellung der Vorderkantenwelle in leicht angehobenem Zustand,
• 6c eine Seitenansicht des Ausführungsbeispiels mit einer Stellung der Vorderkantenwelle in voll angehobener Stellung.

Show it:

• 1 a sheet-processing printing machine in section in a schematic representation,
• 2 a perspective view of the device according to the invention from behind against the sheet transport direction,
• 3 the device according to the invention from the side in a schematic representation,
• 4 a top view of the non-stop rake with rake frame or trolley,
• 5 a side view of a device not according to the invention with a pneumatically actuated working cylinder,
• 6a a side view of the embodiment with a position of the leading edge shaft in the basic position,
• 6b a side view of the embodiment with a position of the leading edge shaft in a slightly raised state,
• 6c Figure 14 is a side view of the embodiment with the leading edge shaft in the fully raised position.

A sheet 7 processing machine, z. B. a printing press 1, has a feeder 2, at least one printing unit 3 or 4 and a boom 6. The sheets 7 are removed from a sheet stack 8 and fed to the printing units 3 and 4 individually or in imbricated form via a feed table 9 . In a known manner, these each contain a plate cylinder 11; 12. The plate cylinders 11 and 12 each have a device 13, 14 for fastening flexible printing plates. In addition, each plate cylinder 11; 12 a device 16; 17 assigned for the semi or fully automatic printing plate change.

The stack of sheets 8 rests on a stack plate 10 that can be raised in a controlled manner. The sheets 7 are removed from the top of the sheet stack 8 by means of a so-called suction head 18 which has, among other things, a number of lifting and towing suckers 19, 21 for separating the sheets 7. In addition, the blowing devices 22 are provided for loosening the upper sheet layers and feeler elements 23 for stack tracking. A number of lateral and rear stops 24 are provided for aligning the stack of sheets 8, in particular the upper sheets 7 of the stack of sheets 8.

The boom 6 has i.a. a main stacking plate 26 for receiving a stack 27 of sheets. The sheets 7 are fed to the sheet stack 27 by means of a chain gripper system 28 . Front edge stops 29 are arranged in the upper stack area on the front edge 31 of the stack and support exact stack formation.

The leading edge stops 29 are spaced from each other on a common leading edge shaft 32 . The leading edge shaft 32 is pivoted in a holder 33 and arranged to be vertically displaceable by means of the holder 33 . The vertical displaceability is made possible by linear guides 36, 37 arranged on both sides of the cantilever frame 34. The leading edge shaft 32 carries at each of its ends a rotatably mounted roller 38; 39 trained support element.

A provided for the non-stop stack change auxiliary stack carrier 41 in the form of a rake or hurdle board has z. B. a number of slide bars 42 which are attached to a U-shaped frame 43. The frame 43 is mounted horizontally together with the rake bars 42 for receiving the auxiliary stack—against the sheet transport direction—into the stacking area. The U-shaped frame 43 surrounds the rack bars 42 and has at its ends pointing in the direction of the stack 27 a starting bevel 44, 46 which come into working contact with the rollers 38, 39 when the rack bars 42 are introduced into the stack area. As a result, the roller 38; 39 is raised and correspondingly takes the leading edge shaft 32 with the attached leading edge stops 29 and the holder 33 with it. One of the holders 33 has on one side of the cantilever frame 34 a control contour 47 which comes into working contact with a switch 48 arranged on the cantilever frame 34 if the leading edge shaft 32 should be raised above a predetermined level, e.g. B. by the lifting of the leading edge shaft 32 by the main stack 27. The main stack drive is stopped by the subsequent switch actuation.

In accordance with a non-inventive device 5 it is provided that the leading edge shaft 32 is lifted by a remotely controllable actuator 49 as soon as the rake 42, 43 gets into the detection range of a sensor 51 or switching range of a switch in the vicinity of the leading edge shaft 32. In this case, a signal is generated via the machine control 50 connected to the sensor 51 or switch, which results in the activation of the actuator 49 . The actuator 49 is shown as a pneumatically acting working cylinder. Of course, however, hydraulically or magnetically or electrically actuated adjusting devices can also be used.

6a shows the non-stop rake 42, 43 with the starting bevel 46 in a position in front of the main stack 27. The sheet-processing machine, preferably a printing press, is in continuous printing, with the sheets brought in by the chain gripper system 28 being deposited on the sheet stack 27, after they have hit the leading edge stops 29. A sheet catcher 53 is also located outside of the stacking area.

To bring in the auxiliary stacking device (rakes 42, 43), the sheet catcher 53 is first introduced into the stacking area. Almost simultaneously, the rake 42, 43 is introduced into or over the main stack 27 by a horizontal displacement movement. Here, the run-on bevels 44, 46 hit the rollers 38, 39 and lift the leading edge shaft 32. The rollers 38, 39 roll here on the upper side of the frame 43 designed as a control contour 54 ( 6c ).

Reference List

1

printing press

2

investor

3

printing unit

4

printing unit

5

./.

6

boom

7

arc

7a

next arc

8th

stack of sheets

9

infeed table

10

stacking plate

11

plate cylinder

12

plate cylinder

13

pressure plate attachment device

14

pressure plate attachment device

15

./.

16

printing plate storage

17

printing plate storage

18

suction head

19

lifting sucker

20

./.

21

tow sucker

22

blowing device

23

tactile element

24

attack

25

./.

26

Main Stack Plate

27

stack of sheets

28

chain grab system

29

leading edge stops

30

./.

31

leading edge of stack

32

leading edge wave

33

holder

34

boom frame

35

./.

36

linear guide

37

linear guide

38

role

39

role

40

./.

41

auxiliary stack carrier

42

slide rules

43

Frame

44

leading edge

45

./.

46

leading edge

47

Control Contour (33)

48

switch (47)

49

actuator, working cylinder

50

machine control

51

sensor, switch (43)

52

./.

53

bow catcher

54

Control Contour (43)

Claims (6)

Device for aligning sheets by means of front edge stops, the front edge stops being arranged on a common, vertically displaceable front edge shaft, characterized in that means (38, 39; 44, 46; 54) are provided for the vertical displacement of the front edge shaft (32) and that the front edge shaft (32) has support devices (38, 39) which are arranged such that they can be brought into working contact with lifting means (44, 46) of an auxiliary stack carrier (41). device after claim 1 , characterized in that the support devices (38, 39) are rotatably mounted rollers. device after claim 1 or 2 , characterized in that the lifting means (44, 46) on the frame (43) of the auxiliary stack carrier (41) are ramps attached. Device according to one of the preceding claims, characterized in that the leading edge shaft (32) is mounted in a holder (33) which has a control contour (47) for actuating a safety switch (48). device after claim 4 , characterized in that the holder (33) is arranged to be vertically displaceable by means of provided linear guides (36, 37). Device according to one of the preceding claims, characterized in that the device is arranged in the boom (6) of a rotary printing machine.

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